angular.module('demo-hockey')
	.factory('Base64',
    function() {
    	var keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';

		return {
			encode: function (input) {
				var output = "";
				var chr1, chr2, chr3 = "";
				var enc1, enc2, enc3, enc4 = "";
				var i = 0;

				do {
					chr1 = input.charCodeAt(i++);
					chr2 = input.charCodeAt(i++);
					chr3 = input.charCodeAt(i++);

					enc1 = chr1 >> 2;
					enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
					enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
					enc4 = chr3 & 63;

					if (isNaN(chr2)) {
						enc3 = enc4 = 64;
					} else if (isNaN(chr3)) {
						enc4 = 64;
					}

					output = output +
						keyStr.charAt(enc1) +
						keyStr.charAt(enc2) +
						keyStr.charAt(enc3) +
						keyStr.charAt(enc4);
					chr1 = chr2 = chr3 = "";
					enc1 = enc2 = enc3 = enc4 = "";
				} while (i < input.length);

				return output;
			},

			decode: function (input) {
				var output = "";
				var chr1, chr2, chr3 = "";
				var enc1, enc2, enc3, enc4 = "";
				var i = 0;

				// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
				var base64test = /[^A-Za-z0-9\+\/\=]/g;
				if (base64test.exec(input)) {
					window.alert("There were invalid base64 characters in the input text.\n" +
						"Valid base64 characters are A-Z, a-z, 0-9, '+', '/',and '='\n" +
						"Expect errors in decoding.");
				}
				input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

				do {
					enc1 = keyStr.indexOf(input.charAt(i++));
					enc2 = keyStr.indexOf(input.charAt(i++));
					enc3 = keyStr.indexOf(input.charAt(i++));
					enc4 = keyStr.indexOf(input.charAt(i++));

					chr1 = (enc1 << 2) | (enc2 >> 4);
					chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
					chr3 = ((enc3 & 3) << 6) | enc4;

					output = output + String.fromCharCode(chr1);

					if (enc3 != 64) {
						output = output + String.fromCharCode(chr2);
					}
					if (enc4 != 64) {
						output = output + String.fromCharCode(chr3);
					}

					chr1 = chr2 = chr3 = "";
					enc1 = enc2 = enc3 = enc4 = "";

				} while (i < input.length);

				return output;
			}
		};
	}
);